Numerical investigation of turbulent channel flow controlled by spatially oscillating spanwise Lorentz force  

作　　者：Wentang WU Yanji HONG Baochun FAN 

机构地区：[1]National Key Laboratory of Laser Propulsion and Application,Academy of Equipment [2]National Key Laboratory of Transient Physics,Nanjing University of Science and Technology [3]National Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology

出　　处：《Applied Mathematics and Mechanics(English Edition)》2015年第9期1113-1120,共8页应用数学和力学（英文版）

基　　金：Supported by the National Natural Science Foundation of China(Nos.11172140 and 11372356);the Open Project of State Key Laboratory of Explosion Science and Technology in Beijing Institute of Technology(No.KFJJ13-3M)

摘　　要：A formulation of the skin-friction drag related to the Reynolds shear stress in a turbulent channel flow is derived. A direct numerical simulation （DNS） of the turbulent control is performed by imposing the spatially oscillating spanwise Lorentz force. Under the action of the Lorentz force with several proper control parameters, only the periodi- cally well-organized streamwise vortices are finally observed in the near-wall region. The Reynolds shear stress decreases dramatically, especially in the near-wall area, resulting in a drag reduction.A formulation of the skin-friction drag related to the Reynolds shear stress in a turbulent channel flow is derived. A direct numerical simulation （DNS） of the turbulent control is performed by imposing the spatially oscillating spanwise Lorentz force. Under the action of the Lorentz force with several proper control parameters, only the periodi- cally well-organized streamwise vortices are finally observed in the near-wall region. The Reynolds shear stress decreases dramatically, especially in the near-wall area, resulting in a drag reduction.

关 键 词：turbulent channel flow direct numerical simulation （DNS） drag reduction Lorentz force 

分 类 号：O357.5[理学—流体力学]